Implement new "stories showcase" page

[mradamcox]

Upon completion of #81, implement the new design. Within the navbar, a link to this page will replace the "Submit" link shown here:

[mradamcox]

@bodom0015 For this, see #81, and you'll just need to make the general structure of the page. Make the URL path of the page /stories. Then,

1. Create the nav link shown above
2. Do the same in the mobile menu
3. Change the URL in the footer "Stories" link to point to this new page (currently, it's to /archive)

Once you have a feature branch ready with this, make a draft PR to generate a deploy preview, then @Makosak can work on that branch to complete the content.

[mradamcox]

Make the Navbar link called "Overview" (with some new filler text for the sub-title), in 1st position (where Submit is in the screenshot).